HB 112

 
HB 112

HB 112

Description

In the early 1960ies, Hermann Becker (HB) released their “Ultramatic” selfwinding movement. With a diameter of 11 12 lignes, it was up to date; the flattened dial side allowed its integration into the contemporarily fashionable ultra flat watches.

base plate

base plate

It’s easy to see, that all important bearings contain rubies, even the minute wheel bearing. Together with the selfwinding mechanism, this movement can advertize its the high number of 30 jewels.

base plate with center minute wheel

base plate with center minute wheel

Although ETA movements were technically ahead that time, the center minute wheel was still up to date on almost all movements in the early 1960ies, including those movement of HB.

gear train

gear train

The gear train consists of a center minute wheel, followed by the third wheel, center seconds wheel and finally the escape wheel.

side view of the gear train

side view of the gear train

The monometallic screw balance is secured against shocks in two Rufa Antishock bearings and beats slowly with 18000 A/h. It regulates a conventional pallet lever movement of swiss type.

without selfwinding module

without selfwinding module

Without selfwinding mechanism, the HB 112 is more or less nothing but a HB 111, but contains already the required preparations for the selfwinding mechanism like ruby bearings, holes and bearing bushes.

gear train of the selfwinding mechanism

gear train of the selfwinding mechanism

The selfwinding mechanism is constructed as a rocking bar changer. Depending on which direction the oscillating weight rotates, it connects either with the first or with the second reduction wheel, so that at the end, the winding happens always in the same direction.

The two large changing wheels and the rocking bar changer are ruby beared, but not the two wheels of the rocking bar changer.

side view of the selfwinding gear train

side view of the selfwinding gear train

The oscillating weight is axle beared. The axle can easly be changed by releasing its two mounting screws.

Breguet clutch of the selfwinding mechanism

Breguet clutch of the selfwinding mechanism

To decouple the selfwinding gear train when the movement is wound manually, the last reduction wheel, which integrates with the crown wheel, has got a vertically working Breguet clutch.

inside the oscillating weight

inside the oscillating weight

The axle-beared oscillating weight consists of two parts, bolted with three screws.

... with unmounted oscillating weight

... with unmounted oscillating weight

When the oscillating weight is missing, you can spot the clutch at 6 o’clock, which takes care, that the two reduction wheels never turn back.

HB 112: Dial side

HB 112: Dial side

The lavish usage of cap jewels is nice to see. They don’t have to a real function, in the best case, they keep dirt and water away from the oil reservoirs of the bearing rubies. Nevertheless, they increase the number of jewels to be written onto the dial.

In the lab

The specimen shown here came with a broken center seconds wheel and a broken lever into the lab and so could not be brought back to life.

Technical data

Manufacturer:HB
Caliber:112
Number of jewels:30
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): Ruby-Shock
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Hairspring key
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel
  • center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:2 hole(s)
Features:SCD,AUT
Functions:hour, minute, second, selfwinding
A/h:18000
Size:11 1/2''' (measured: 25,6mm)
Literature: Flume: 1962 74
Inventory number:19011

Usage gallery

Marcena Automatic gents watch

Marcena Automatic gents watch

This movement is a kind donation from Klaus Brunnemer to the movement archive. Thank you very much!

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